I got a new SIM last week.
It was in a cardboard envelope sealed with the address sticker.
The SIM was stuck to the cardboard with a small blob of glue.
I don't think that 48 use plastic anymore for environmental reasons.
How do you know that your SIM package was opened?
If it was then you should report it to An Post.
Even if somebody has your SIM number I'm not sure that they can really do anything nefarious with it.
I suspect that you may be worrying unnecessarily.
I'm a bit confused.
You have been having issues since May this year?
I don't understand the comments about rogue app download and problems with email etc.
If two SIM packages arrived open then I would be more inclined to suspect somebody in your property or vicinity.
I'm not really clear on what the precise issue is.
Maybe you can clarify?
Did you contact An Post and/or 48 support?